ford truck 9 inch id help????

[rickyracer1962]

i got a rear end out of a 63 ford truck, its a 9 inch. the truck had a y-block and a truck 4 speed, the tag on the rear end didnt have the ratio, but it had this code. can anyone tell me what the ratio is????


BG-F2
894 FC 301

[Flat Ernie]

[ QUOTE ]
the tag on the rear end didnt have the ratio

[/ QUOTE ]

Look real closely at the tag right near where the nut/washer are - you sure there's not another number in front? I've never seen a tag like that. (but that doesn't mean anything!)

http://www.jalopyjournal.com/ubbthreads/images/graemlins/cool.gif

[rickyracer1962]

only had one tag on it, no ratio just those numbers. anyone???

[SamIyam]

Spin it and find out.

If it's an "open" differential... have someone hold one axle... you spin the pinion and when the axle goes one half a revolution, you have your number:1

If it is a locked rear end and you can't hold one end from turning... count the pinion revolutions and when BOTH axles make ONE revolution... you have your ratio.

Sam.

[Flat Ernie]

[ QUOTE ]
only had one tag on it

[/ QUOTE ]

Yeah - often the first numbers in both the top & bottom lines are obscured by the nut. Check real close to see...

The ratio is the first three digits of the bottom number - yours looks to be a digit shy of a full tag - that's why I thought you should look closely where the nut might have rubbed it off.

BUT that would make it x.89:1 - don't think 3.89:1 was a factory ratio - 3.91:1 was the factory ratio for most that I'm aware of - 3.89:1 is aftermarket & that wouldn't be stamped (obviously), so maybe you do have a goofy tag that doesn't follow the convention...

Sam's way works real well though! http://www.jalopyjournal.com/ubbthreads/images/graemlins/grin.gif


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[choprods]

3.89 is a common Ford Ratio for the early 9" my '60Ford Courier had that [with stick trans]